Development of a numerical simulation system for flying hend slider design in magnetic disk storage with recording density

在磁头-介质界面设计中，引入了一种新的混合粗糙度平均理论，并将其应用到分子气体润滑方程中。在此基础上，实现了一个可考虑任意形状纹理图案的动态仿真系统，并将单位粗糙度模型修正后应用于分子气体润滑方程，计算了磁头滑块在由多种几何形状组成的表面纹理图案上的动态特性。此外，纹理图案的效果是预先计算和编制的流动系数数据库。这使得当混合纹理图案通过时能够计算轴承区域的压力分布。开发的模拟系统能够在改变影响润滑方程和滑块运动方程的数值解的参数的情况下快速有效地计算。特别地，当压力解发散时，系统倒回几个时间步长并使用修改的参数重试计算。因此，它可以有效地调整参数，而无需从头开始重新计算。此外，还引入双目立体图形作为显示系统，以改善系统的人机界面。基于人眼视觉感知评价，确定了最佳立体投影参数，并利用所开发的系统，对典型滑块（锥-平型、负压型和阶梯-垫型）在图案化磁盘表面上的静态和动态飞行特性进行了实验研究。本研究结果对于下一代高密度记录磁盘存储器的浮动磁头滑块和纹理图案化磁盘的设计具有一定的参考价值。

In the head-medium interface design of a magnetic disk drive, a new mixed roughness averaging theory was introduced and implemented into the molecular gas lubrication equation. A dynamic simulation system which can take the texture pattern of arbitrary form into consideration was realized based on the results.To calculate dynamic characteristics of a head slider on surface texture patterns which is composed of several geometrical shapes, the unit roughness model is modified and applied to the molecule gas lubrication equation. Moreover, the effect of the texture pattern is pre-calculated and compiled a flow coefficient database. This enables the calculation of pressure distribution of a bearing area when mixed texture patterns pass through.The developed simulation system enables rapid and efficient calculation while changing parameters that affect the numerical solution of the lubrication equation and the equation of slider motion. Especially, when the pressure solution diverges, the system rewinds several time steps and retries the calculation with modified parameters. Therefore, it can adjust parameters efficiently without recalculating from the beginning. Furthermore, the binocular stereo graphics is introduced as a display system to improve the human interface of the system. The parameter of the optimal stereo projection was clarified based on evaluation of human visual perception.Using the system developed in the present research, the static and dynamic flying characteristics of the typical sliders (taper-flat type, negative-pressure type and step-pad type) on a patterned disk surface were demonstrated. It is thought that the result of this research is effective in the design of the flying head slider and the texture patterned disk for the next generation of high-density recording magnetic disk storage.